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65 years of progress, a progress that will continue on and on.


SAKAEGUMI has been engaged in civil engineering, construction, and pavement work since 1955. In 1975, it was the first in the region to produce asphalt, thus contributing to the spread of paved roads. From 2007, it began developing concrete crack repair technology, focusing on concrete crack injection, and has been working to prolong the lifespan of concrete structures through its SAPIS and SIMMS technologies, which synergistically consist of investigation and diagnosis, section repair, combined repair and reinforcement work, and post-work evaluation.

SAKAEGUMI has been engaged in civil engineering, construction, and pavement work since 1955. In 1975, it was the first in the region to produce asphalt, thus contributing to the spread of paved roads. From 2007, it began developing concrete crack repair technology, focusing on concrete crack injection, and has been working to prolong the lifespan of concrete structures through its SAPIS and SIMMS technologies, which synergistically consist of investigation and diagnosis, section repair, combined repair and reinforcement work, and post-work evaluation.

We engage in: construction work; investigation and diagnosis with planning, design, and implementation of repair and reinforcement work for concrete structures; leasing of a patented construction method; water jet construction; repair equipment R&D; development and spread of UAV and USV; import and sale of repair materials; examination of construction materials (aggregate and soil); and sale and maintenance of environmental equipment.

In Brazil and Indonesia, SAKAEGUMI provides repair and reinforcement technology for vital concrete structures. To cut infrastructure life cycle costs, the importance of preventive maintenance is now recognized globally, with efforts shifting from corrective to preventive maintenance by technological means.

SAKAEGUMI's SAPIS crack repair technology is highly valued overseas and is attracting public and private sector attention in Brazil and Indonesia.

In order to provide a complete solution service for concrete structures and contribute to the extension of life of maintenance and infrastructure, SAKAEGUMI develops and provides a construction system and infrastructure repair construction management system to unify the management of four processes, namely (i) repairing cracks and deteriorated parts of concrete structures using the Adjustable Pressure Injection System; (ii) investigating and evaluating a multilayered deterioration using various nondestructive inspection machines and other equipment; (iii) cleaning and treating deteriorated parts using ultrahigh pressure water (Water Jet) before the repair and reinforcement without damaging healthy parts; and (iv) making property recovery evaluation after the repair and reinforcement.

Concrete crack repair technologies generally used for the purpose of extending the life of concrete structures include methods such as the crack coating method, injection method, and filling method. Currently the mainstream method is the injection method, which pours repair materials to close cracks. However, insufficient injection of repair materials or adhesion failure has frequently caused re-deterioration at an early stage after the repair, which has been an issue within the industry. The Adjustable Pressure Injection System, which has been internally developed by SAKAEGUMI to overcome the problems due to these causes, is divided into Vacuum Adsorption Type Adjustable Pressure Injection System and Nozzle Type Adjustable Pressure Injection System. The difference between these systems are related to how the repair materials are injected, whether from the concrete surface or from inside.

SAPIS has made it possible to inject properly wide-range of crack repair materials from organic to inorganic, from the depth to the surface of a crack by adjusting the injection pressurefrom low to high.

SIMMS technologies, which synergistically consist of investigation and diagnosis, section repair, combined repair and reinforcement work, and post-work evaluation. 

SAPIS is a breakthrough injecting method for concrete cracks excellent in injecting technology, adaptability and economic efficiency.

Features of SAPIS

(1) Technological features

Main features of the Adjustable Pressure Injection Systems (common features of both Vacuum Absorption Type and Nozzle Type):
- The injection pressure can be adjusted freely according to the injection conditions, and the injection performance is higher than existing methods because it can be injected from the deep part of the crack to the surface part.
- Various repair materials ranging from organic to inorganic types can be injected regardless of the target, and high repair effect can be anticipated even if various materials with different repair effects are injected continuously.
- Adjustable Pressure Injection Systems allow for repeated use of infusion devices without any adhesive curing of the infusion devices that are essentially required by the existing methods.
Therefore, this new method will reduce infusion materials and environmental burden without generating any wastes.
These three points can be highlighted. Moreover, since waterproof materials can be combined in water-leaking cracks, caulking effects can be anticipated, which has been difficult technology today. Furthermore, since no adhesive is required and the concrete frame is not soiled, the new methods will allow for repair with a better appearance.

(2) Product and technology specifications and prices

The specifications and prices of Vacuum Adsorption Type Adjustable Pressure Injection System and Nozzle Type Adjustable Pressure Injection System are shown in the following table.
Unlike other existing methods, both the Vacuum Adsorption Type Adjustable Pressure Injection System and the Nozzle Type Adjustable Pressure Injection System do not attach any injection devices, making the construction period shorter.
The repair construction cost is calculated based on 50m construction, and the total cost of labor, material, equipment and others is approximately 9,000 JPY per meter for the Vacuum Adsorption Type Adjustable Pressure Injection System, and approximately 12,000 JPY per meter for the Nozzle Type Adjustable Pressure Injection System.
In addition to their performance that surpasses the existing technologies, the quality of repair work is improved by the management standards that are
not generally established in Japan.


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